|
| | | | |
| | | |
| Stat |
Members: 3644
Articles: 2'497'992
Articles rated: 2609
16 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The Enrichment History of Hot Gas in Poor Galaxy Groups | | David S. Davis
; John S. Mulchaey
; Richard F. Mushotzky
; | | Date: |
10 Aug 1998 | | Subject: | astro-ph | | Affiliation: | MIT), John S. Mulchaey (Carnegie Obs.), Richard F. Mushotzky (NASA/GSFC | | Abstract: | We have analyzed the ASCA SIS and GIS data for seventeen groups and determined the average temperature and abundance of the hot x-ray emitting gas. For groups with gas temperatures less than 1.5 keV we find that the abundance is correlated with the gas temperature and luminosity. We have also determined the abundance of the alpha-elements and iron independently for those groups with sufficient counts. We find that for the cool groups (i.e. kT <1.5 keV) the ratio of alpha-elements to iron is ~1, about half that seen in clusters. Spectral fits with the S, Si and Fe abundances allowed to vary separately suggest the S/Fe ratio is similar to that seen in clusters while the Si/Fe ratio in groups is half the value determined for richer systems. The mass of metals per unit blue luminosity drops rapidly in groups as the temperature drops. There are two possible explanations for this decrease. One is that the star formation in groups is very different from that in rich clusters. The other explanation is that groups lose much of their enriched material via winds during the early evolution of ellipticals. If the latter is true, we find that poor groups will have contributed significantly (roughly 1/3 of the metals) to the enrichment of the intergalactic medium. | | Source: | arXiv, astro-ph/9808085 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER